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BCM 4.0 Networking Configuration Guide
Chapter 43
VoIP overview
On the BCM, the LAN configuration consists of two components: Router LAN configuration,
which determines how the router communicates with devices on the LAN, and Main Module LAN
configuration, which determines how the Main Module of the BCM communicates with other
devices on the LAN.
IP telephones
IP telephones offer the functionality of regular telephones, but do not require a hardwire
connection to the BCM. Instead, they must be plugged into an IP network, which is connected to
the LAN or WAN on the BCM. Calls made from IP telephones through the BCM can pass over
VoIP trunks or across a Public Switched Telephone Network (PSTN).
Nortel provides two types of IP telephones. The IP telephones are wired to the IP network using
Ethernet, or are accessed through your desktop or laptop computer, as in the case of the Nortel
i2050 Software Phone.
VoIP trunks
VoIP trunks allow voice signals to travel across IP networks. A gateway within the BCM converts
the voice signal into IP packets, which are then transmitted through the IP network to a gateway on
the remote system. The device at the other end reassembles the packets into a voice signal.
Creating an IP telephony network
An IP telephony network consists of telephones, gatekeepers, IP networks, and access to a PSTN.
Networking with BCM
The BCM is a key building block in creating your communications network. It interoperates with
many devices, including the Meridian 1, Succession, and other BCM devices. You can connect the
BCM system to devices through multiple IP networks, as well as through the PSTN. Multiple
BCM systems also can be linked together on a network of VoIP trunks and/or dedicated physical
lines.
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